Audio Problems - Lenovo ThinkCentre M800 User Manual

• If your computer has a secondary power switch on the rear of the computer, ensure that it is switched on.
• The power indicator on the front of the computer is on.
• The computer voltage matches the voltage available at the electrical outlet for your country or region.
The operating system fails to start up
Solution: Ensure that the startup sequence includes the device where the operating system resides. Usually,
the operating system is on the storage drive. For more information, see "Changing the startup device
sequence permanently" on page 37.
The computer beeps multiple times before the operating system starts up
Solution: Ensure that no keys are stuck.

Audio problems

This section provides solutions to audio-related problems.
No audio in Windows
Solutions:
• If you are using powered external speakers that have an On/Off control, ensure that:
– The On/Off control is set to the On position.
– The speaker power cable is connected to a properly grounded, functional ac electrical outlet.
• If your external speakers have a volume control, ensure that the volume is not set too low.
• Click the volume icon in the Windows notification area on the taskbar. Ensure that the mute speakers
settings are not selected and none of the volume settings is set too low.
Note: If the volume icon is not displayed in the Windows notification area, add the icon to the notification
area. See "Adding an icon to the Windows notification area" on page 15.
• Some models have a front audio panel you can use to adjust volume. If you have a front audio panel,
ensure that the volume is not set too low.
• Ensure that your external speakers (and headphones, if used) are connected to the correct audio
connector on the computer. Most speaker cables are color-coded to match the connector.
Note: When external-speaker or headphone cables are connected to the audio connector, the internal
speaker, if present, is disabled. In most cases, if an audio adapter is installed in one of the expansion
slots, the audio function built into the system board is disabled. Therefore, you must use the audio
connectors on the audio adapter.
• Ensure that the program you are running is designed for use in the Microsoft Windows operating system.
If the program is designed to run in DOS, the program does not use the Windows sound feature. The
program must be configured to use SoundBlaster Pro or SoundBlaster emulation.
• Ensure that the audio device drivers are correctly installed.
Sound comes only from one external speaker
Solutions:
• Ensure that the speaker cable is inserted completely into the connector on the computer.
• Ensure that the cable that connects the left speaker to the right speaker is securely connected.
• Click the volume icon in the Windows notification area on the taskbar. Then, click the speaker icon on top
of the volume control. Click the Levels tab and ensure that the Balance settings are set correctly .
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ThinkCentre M800 and M900 User Guide